CN107202148B

CN107202148B - Lockup device for torque converter

Info

Publication number: CN107202148B
Application number: CN201710133120.2A
Authority: CN
Inventors: 松田哲
Original assignee: Exedy Corp
Current assignee: Exedy Corp
Priority date: 2016-03-18
Filing date: 2017-03-07
Publication date: 2022-04-19
Anticipated expiration: 2037-03-07
Also published as: DE102017104632A1; JP2017166669A; CN107202148A; KR102323869B1; US20170268647A1; KR20170108859A; US10408321B2; JP6654072B2

Abstract

The invention provides a lock-up device of a torque converter, which can restrain deformation of an oil chamber plate of an oil chamber for actuating a piston by a simple structure. The lock device includes a clutch plate (31), a piston (32), a sleeve (33), and an oil chamber plate (34). The piston (32) is disposed to be movable in the axial direction so as to press-contact the clutch plate (31). The sleeve (33) is fixed to the front cover (2), and has an outer peripheral surface and an annular flange (33b) that protrudes radially outward from the outer peripheral surface, and the inner peripheral surface of the piston (32) is supported on the outer peripheral surface of the sleeve (33) so as to be movable in the axial direction. The oil chamber plate (34) is formed in a disc shape, a first oil chamber (C1) is formed between the oil chamber plate and the piston (32), and working oil for operating the piston (32) is supplied to the first oil chamber (C1). The oil chamber plate (34) is joined to the piston (32) -side surface of the flange (33b) of the sleeve (33).

Description

Lockup device for torque converter

Technical Field

The present invention relates to a lock-up device, and more particularly to a lock-up device for a torque converter for transmitting torque from a front cover to a transmission-side member via a turbine.

Background

In many cases, a torque converter is provided with a lock-up device for directly transmitting torque from a front cover to a turbine. This lock device has: the engine includes a piston frictionally connectable to a front cover, an input side plate fixed to the piston, a plurality of torsion springs supported by the input side plate, and an output side plate elastically connected to the piston and the input side plate in a rotational direction by the plurality of torsion springs. The output side plate is fixed to the turbine.

Further, as shown in patent document 1, a lock device using a plurality of friction linings for increasing a clutch capacity of the lock device has also been proposed.

The lock device shown in patent document 1 is configured such that a clutch plate is disposed between a front cover and a turbine. Then, the clutch plate is pressed between the front cover and the piston to be brought into a locked state (power transmission state). In this state, the torque from the front cover is directly transmitted to the turbine without passing through the torque converter body.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-217452

Disclosure of Invention

Technical problem to be solved by the invention

In the lock device of patent document 1, an oil chamber plate is disposed between the piston and the turbine, and an oil chamber for piston operation is formed between the piston and the oil chamber plate. The inner peripheral end of the oil chamber plate is fixed to the outer peripheral surface of a sleeve-shaped hub (boss) fixed to the front cover by welding.

In such a configuration, when the hydraulic oil is supplied to the oil chamber, a force acts on the oil chamber plate in a direction away from the piston. When the oil chamber plate is deformed by this force, the oil chamber plate may not function as an oil chamber. In addition, breakage of the oil chamber plate may be caused. Therefore, it is necessary to increase the thickness of the oil chamber plate to improve the rigidity.

The technical problem of the present invention is to suppress deformation of an oil chamber plate constituting an oil chamber for actuating a piston with a simple structure.

Means for solving the technical problem

(1) The lockup device for a torque converter according to the present invention is a device for transmitting torque from a front cover to a member on the transmission side via a turbine. The locking device includes a clutch portion, a piston, a sleeve, and an oil chamber plate. The clutch portion is disposed between the front cover and the turbine. The piston is arranged to be movable in the axial direction so that the clutch portion is in a torque transmission state. The sleeve is fixed to the front cover, and has an outer peripheral surface and an annular projecting portion projecting radially outward from the outer peripheral surface, and the inner peripheral surface of the piston is supported on the outer peripheral surface so as to be movable in the axial direction. The oil chamber plate is formed in a circular plate shape, an oil chamber is formed between the oil chamber plate and the piston, and working oil for operating the piston is supplied to the oil chamber. Further, the oil chamber plate is engaged with a piston-side surface of the projection portion of the sleeve.

In this device, when the hydraulic oil is supplied to the oil chamber, the piston moves in the axial direction, and the clutch portion is brought into a torque transmission state.

When the hydraulic oil is supplied to the oil chamber, the oil chamber plate receives a force in a direction away from the piston due to the hydraulic pressure generated in the oil chamber. However, since the inner peripheral portion of the oil chamber plate is joined to the piston-side surface of the projecting portion of the sleeve, the oil chamber plate is supported by the projecting portion of the sleeve from the side opposite to the direction in which the oil chamber plate receives force. Therefore, deformation of the oil chamber plate is suppressed.

(2) Preferably, the inner peripheral portion of the oil chamber plate and the protruding portion of the sleeve are welded.

(3) Preferably, the oil chamber plate has a cylindrical portion that movably supports an outer peripheral surface of the piston. Here, the oil chamber can be formed with a small number of components.

(4) Preferably, the device further includes sealing members respectively provided between an inner peripheral surface of the piston and an outer peripheral surface of the sleeve, and between the outer peripheral surface of the piston and an inner peripheral surface of the cylindrical portion of the oil chamber plate. The sleeve has an oil passage for supplying the working oil to the oil chamber.

(5) Preferably, a drive hub is also included that is fixed to the sleeve. The piston has an engagement portion that engages with a part of the drive hub, and rotates in synchronization with the drive hub.

Here, the piston rotates synchronously with the sleeve to which the drive hub is fixed. I.e. no relative rotation between the piston and the sleeve occurs. Therefore, the piston and the sleeve can be prevented from being worn, and in addition, when a seal is provided between them, the seal can be prevented from being worn.

Effects of the invention

In the present invention as described above, deformation of the oil chamber plate constituting the oil chamber for operating the piston can be suppressed with a simple configuration.

Drawings

FIG. 1 is a cross-sectional view of a torque converter having a lockup device according to an embodiment of the invention.

Fig. 2 is an extracted view showing a portion supporting the clutch portion and the piston of fig. 1.

Fig. 3 is a front partial view of the piston.

Fig. 4 is an extracted view showing the vibration damping portion of fig. 1.

Fig. 5 is a diagram illustrating a positioning structure of the vibration damping portion.

Fig. 6 is a diagram showing the torsion characteristic of the lock device.

Detailed Description

Fig. 1 is a partial sectional view of a torque converter 1 having a lock-up device according to an embodiment of the present invention. An engine (not shown) is disposed on the left side of fig. 1, and a transmission (not shown) is disposed on the right side of the drawing. It should be noted that the O-O shown in FIG. 1 is the axis of rotation of the torque converter and locking device. Hereinafter, the direction away from the rotation axis is referred to as "radial direction", and the direction along the rotation axis is referred to as "axial direction".

(integral construction of torque converter 1)

The torque converter 1 is a device for transmitting torque from an engine-side crankshaft (not shown) to an input shaft of a transmission. As shown in fig. 1, the torque converter 1 includes a front cover 2, a torque converter main body 6, and a lock-up device 7.

The front cover 2 is fixed to the input-side member. The front cover 2 is a substantially disk-shaped member, and an outer peripheral cylindrical portion 10 that protrudes toward the transmission side is formed on the outer peripheral portion thereof.

The torque converter main body 6 includes three types of impellers (the pump impeller 3, the turbine runner 4, and the stator 5).

The pump impeller 3 includes: a pump wheel housing 12 fixed to the outer peripheral cylindrical portion 10 of the front cover 2 by welding, a plurality of pump wheel pieces 13 fixed to the inside of the pump wheel housing 12, and a cylindrical pump hub 14 provided on the inner peripheral side of the pump wheel housing 12.

The turbine 4 is disposed opposite to the pump impeller 3 in the fluid chamber. The turbine 4 includes a turbine shell 15, a plurality of turbine blades 16 fixed to the inside of the turbine shell 15, and a turbine hub 17 fixed to the inner peripheral side of the turbine shell 15. The turbine hub 17 has a flange 17a extending radially outward. The inner peripheral portion of the turbine shell 15 is fixed to the flange 17a by a plurality of rivets (not shown) or welding. Further, a spline hole into which an input shaft (not shown) of the transmission engages is formed in an inner peripheral portion of the turbine hub 17.

The stator 5 is disposed between the pump impeller 3 and the inner peripheral portion of the turbine runner 4, and adjusts the flow of the hydraulic oil returned from the turbine runner 4 to the pump impeller 3. The stator 5 is mainly composed of a stator carrier 20 and a plurality of stator blades 21 provided on the outer peripheral surface thereof. The stator carrier 20 is supported on a fixed shaft via a one-way clutch 22. It is to be noted that

thrust bearings

24, 25 are provided on both axial sides of the stator carrier 20.

(locking device 7)

As shown in fig. 1 and 2, the lock device 7 is disposed in a space between the front cover 2 and the turbine 4. The lock device 7 includes a clutch unit 28 and a damper portion 29.

(Clutch unit 28)

As shown in fig. 1 and 2, the clutch unit 28 is a multi-plate clutch. The clutch unit 28 has: a plurality of clutch plates 31 (clutch portions), a piston 32, and a support member 35 composed of a sleeve 33 and an oil chamber plate 34.

Clutch plate 31

The plurality of clutch plates 31 are disposed between the front cover 2 and the piston 32. The plurality of clutch plates 31 include two first clutch plates 31a and two second clutch plates 31 b. The first clutch plates 31a and the second clutch plates 31b are each formed in a ring shape and are alternately arranged in the axial direction. A plurality of teeth are formed on the inner peripheral portion of the first clutch plate 31 a. Friction linings are fixed to one surface of each of the first clutch plate 31a and the second clutch plate 31 b. A plurality of teeth are formed on the outer peripheral portion of the second clutch plate 31 b.

Piston 32-

The piston 32 is formed in a ring shape and is disposed on the transmission side of the front cover 2. The piston 32 is supported by a support member 35 so as to be movable in the axial direction. The piston 32 has a pressing portion 32a and a plurality of engaging convex portions 32 b. The pressing portion 32a is a portion that presses the plurality of clutch plates 31 toward the front cover 2 side. The pressing portion 32a is provided on the outer peripheral portion of the piston 32 so as to face the plurality of clutch plates 31 in the axial direction. The engaging convex portion 32b is formed on the inner circumferential portion of the piston 32 so as to protrude toward the inner circumferential side. As shown in fig. 3, the plurality of engaging protrusions 32b are formed at predetermined intervals in the circumferential direction. Note that fig. 3 is a front view of the piston 32 as viewed from the front cover 2 side.

Support member 35

The sleeve 33 constituting the support member 35 has an annular projection 33a projecting in the axial direction on the side surface on the front cover 2 side. Therefore, gaps are formed between the front cover 2 and the inner and outer circumferential sides of the annular convex portion 33 a. The annular projection 33a is fixed to a side surface of the front cover 2 by welding or the like, and the sleeve 33 rotates in synchronization with the front cover 2. An annular flange 33b that protrudes radially outward is formed on the outer peripheral portion of the sleeve 33 at the end on the turbine 4 side.

A drive hub 37 supporting the first clutch plate 31a is fixed to the sleeve 33. The drive hub 37 has: a substantially annular hub body 37a, and a cylindrical portion 37b formed by bending an outer peripheral portion of the hub body 37a toward the front cover 2.

The hub main body 37a is fixed to the front cover 2 side surface of the sleeve 33. A plurality of slits 37c extending in the axial direction are formed in the cylindrical portion 37b at predetermined intervals along the circumferential direction. The slit 37c is open on the front cover 2 side. Teeth formed on the inner peripheral portion of the first clutch plate 31a engage with the plurality of slits 37 c. Thereby, the first clutch plate 31a is relatively non-rotatable with respect to the drive hub 37, that is, the sleeve 33, but relatively movable in the axial direction.

The oil chamber plate 34 constituting the support member 35 is disposed on the turbine 4 side of the piston 32. The oil chamber plate 34 includes a disk-shaped main body portion 34a and a cylindrical portion 34b formed on the outer peripheral portion of the main body portion 34 a. The inner peripheral portion of the body portion 34a is fixed to the flange 33b of the sleeve 33. The cylindrical portion 34b is formed by bending the outer peripheral portion of the main body portion 34a toward the front cover 2. Then, the outer peripheral portion of the piston 32 is supported by the cylindrical portion 34b so as to be movable in the axial direction.

(supporting structure of oil chamber plate 34)

The inner peripheral portion of the main body portion 34a of the oil chamber plate 34 is fixed to the side surface of the flange 33b of the sleeve 33 on the front cover 2 side by welding. Here, the oil chamber plate 34 is a member for constituting an oil chamber (a first oil chamber C1 described later) between the oil chamber plate 34 and the piston 32. Therefore, when the working oil is supplied to the oil chamber, a force acts on the oil chamber plate 34 on the side away from the piston 32. However, since the oil chamber plate 34 is fixed to the side surface of the flange 33b on the piston 32 side, which is the side opposite to the side on which the force acts, the oil chamber plate 34 that receives the force generated by the hydraulic pressure is supported by the flange 33b, and deformation of the oil chamber plate 34 can be suppressed.

(synchronizing mechanism)

The engaging protrusions 32b of the piston 32 engage with the slits 37c of the drive hub 37. Thereby, the piston 32 rotates in synchronization with the sleeve 33 and the front cover 2 via the drive hub 37. That is, the slit 37c of the drive hub 37 and the engaging convex portion 32b of the piston 32 constitute a synchronization mechanism for synchronizing the rotation of the piston 32 and the rotation of the support member 35.

Note that the slit 37c engages with the engaging convex portion 32b of the piston 32 over the entire movement range of the piston 32. Therefore, even if the piston 32 moves in the axial direction, the engagement between the two does not disengage.

(oil pressure circuit)

A seal S1 is provided on the outer peripheral surface of the sleeve 33, and the space between the outer peripheral surface of the sleeve 33 and the inner peripheral surface of the piston 32 is sealed. Further, a seal S2 is provided on the outer peripheral surface of the piston 32, and the outer peripheral surface of the piston 32 and the inner peripheral surface of the cylindrical portion 34b of the oil chamber plate 34 are sealed. With such a configuration, a first oil chamber C1 for pressing the piston 32 against the clutch plate 31 is formed between the piston 32 and the oil chamber plate 34.

A hydraulic circuit for supplying the hydraulic oil supplied from the inner peripheral portion of the turbine hub 17 to the first oil chamber C1 is formed in the sleeve 33. The hydraulic circuit includes a first oil passage P1, a second oil passage P2, and an oil sump Ph.

The sump Ph is formed on the side surface of the sleeve 33 on the turbine 4 side. More specifically, an annular groove 33c recessed toward the front cover 2 is formed in the side surface of the sleeve 33 on the turbine 4 side. Further, an annular plate 39 is fixed to the sleeve 33 to close the groove 33 c. That is, the groove 33c and the plate 39 form an oil sump Ph.

The first oil passage P1 is formed from the inner peripheral surface of the annular convex portion 33a of the sleeve 33 toward the oil sump Ph. The first oil passage P1 is formed of a plurality of holes, each of which is inclined from the inner periphery to the outer periphery so as to approach the turbine 4.

The second oil passage P2 is formed to communicate the oil sump Ph with the first oil chamber C1. The second oil passage is formed by a plurality of holes, and each hole is formed radially so as to be orthogonal to the rotation axis.

Note that the entire flow passage area of the second oil passage P2 is set smaller than the entire flow passage area of the first oil passage P1. Further, the diameter of each hole constituting the second oil passage P2 is smaller than the diameter of each hole constituting the first oil passage P1. With this configuration, a hole effect can be obtained when the hydraulic oil flows through the first oil passage P1 and the second oil passage P2, the speed of the hydraulic oil flowing out of the second oil passage P2 and the pulsation of the oil pump can be suppressed, and the shock at the time of clutch engagement can be alleviated. In this embodiment, since the oil sump Ph is formed between the first oil passage P1 and the second oil passage P2, pulsation of the oil pump can be further suppressed.

Further, a second oil chamber C2 is formed between the inner peripheral portion of the sleeve 33 and the turbine hub 17. The working oil is supplied to the second oil chamber C2 from a hole 17b formed in the flange 17a of the turbine hub 17. A third oil passage P3 is formed in the sleeve 33 to communicate between the second oil chamber C2 and the space in which the clutch plates 31 are disposed.

(vibration damping part 29)

The vibration damping portion 29 damps vibration input from the front cover 2. As shown in fig. 4, the vibration damping portion 29 includes: an input side plate 40, an inner peripheral side torsion spring 41, an intermediate plate 42, an outer peripheral side torsion spring 43, and a driven plate 44.

Input side panel 40-

The input side plate 40 is provided on the output side of the clutch unit 28. Specifically, the input side plate 40 includes a first side plate 45 and a second side plate 46.

The first side plate 45 is disposed on the engine side. The first side plate 45 has: a first clutch engaging portion 45a extending toward the front cover 2, and a plurality of first spring engaging portions 45 b.

The first clutch engagement portion 45a is formed substantially in a cylindrical shape. A plurality of grooves extending in the axial direction are formed at predetermined intervals in the circumferential direction in the first clutch engagement portion 45 a. Teeth formed on the outer peripheral portion of the second clutch plate 31b engage with the plurality of grooves. Therefore, the second clutch plates 31b and the first side plate 45 cannot rotate relative to each other, but can move relative to each other in the axial direction.

The plurality of first spring engagement portions 45b are formed at portions extending radially inward from the turbine side of the first clutch engagement portion 45 a. Specifically, the plurality of first spring engagement portions 45b are window portions arranged at predetermined intervals in the circumferential direction. Cut-and-raised (cut-and-raised) portions that are cut and raised in the axial direction are formed on the inner peripheral portion and the outer peripheral portion of each first spring engagement portion 45 b. The inner peripheral torsion spring 41 is disposed in each first spring engagement portion 45 b. Further, a pair of circumferentially opposite wall portions of each first spring engaging portion 45b are engaged with both end portions of the inner peripheral side torsion spring 41.

The second side plate 46 is disposed on the transmission side. The second side plate 46 is disposed at a predetermined interval from the first side plate 45 in the axial direction. The second side plate 46 is integrally rotatably fixed to the first side plate 45 by a plurality of stud pins 47.

The second side plate 46 has a plurality of second spring engagement portions 46 a. The plurality of second spring engagement portions 46a are window portions arranged at predetermined intervals along the circumferential direction. The second spring engagement portions 46a are disposed to face the first spring engagement portions 45b in the axial direction. Cut-and-raised (cut-and-raised) portions that are cut and raised in the axial direction are formed on the inner circumferential portion and the outer circumferential portion of each second spring engagement portion 46 a. The inner-periphery-side torsion spring 41 is disposed in each second spring engagement portion 46 a. Further, a pair of circumferentially opposite wall portions of each second spring engaging portion 46a are engaged with both end portions of the inner peripheral side torsion spring 41.

Inner peripheral side torsion spring 41-

The plurality of inner peripheral side torsion springs 41 are arranged in a circumferential direction.

Each of the plurality of inner periphery side torsion springs 41 has a large coil spring 41a and a small coil spring 41 b. The small coil spring 41b is inserted inside the large coil spring 41a and is shorter than the spring length of the large coil spring 41 a.

The inner peripheral side torsion springs 41 are disposed in a first spring engaging portion 45b (window portion) and a second spring engaging portion 46a (window portion) of the

side plates

45, 46, and a third spring engaging portion 42a (window portion) of the intermediate plate 42, which will be described later. Both ends in the circumferential direction and both sides in the radial direction of each inner peripheral side torsion spring 41 are supported by first to third

spring engaging portions

45b, 46a, 42a (window portions). Further, the axial protrusion of each inner peripheral side torsion spring 41 is restricted by the cut-and-raised portions of the first spring engaging portion 45b (window portion) and the second spring engaging portion 46a (window portion).

Intermediate plate 42-

The intermediate plate 42 is disposed between the first side plate 45 and the second side plate 46 in the axial direction. The intermediate plate 42 is rotatable relative to the

side plates

45 and 46 and the driven plate 44. The intermediate plate 42 is a member for operating the inner torsion spring 41 and the outer torsion spring 43 in series.

The outer peripheral portion of the intermediate plate 42 is formed substantially in a cylindrical shape and has a turbine 4-side opening. The outer peripheral cylindrical portion of the intermediate plate 42 holds the outer peripheral side torsion spring 43. Further, a fifth spring engaging portion 44b of the driven plate 44 described later is disposed in the opening of the outer peripheral cylindrical portion.

The intermediate plate 42 has a plurality of third spring engagement portions 42a, a plurality of fourth spring engagement portions 42b, and long holes 42 d.

Each of the third spring engaging portions 42a is provided on the inner peripheral portion of the intermediate plate 42 and engages with the inner peripheral side torsion spring 41. The plurality of third spring engagement portions 42a are window portions arranged at predetermined intervals in the circumferential direction. Each third spring engaging portion 42a is disposed between the first and second

spring engaging portions

45b, 46a so as to face the first and second

spring engaging portions

45b, 46a in the axial direction. The inner peripheral torsion spring 41 is disposed in each third spring engagement portion 42 a. Further, a pair of circumferentially opposite wall portions of each third spring engaging portion 42a are engaged with both end portions of the inner peripheral side torsion spring 41.

Each of the plurality of fourth spring engaging portions 42b is provided at a predetermined interval in the circumferential direction on the outer peripheral portion of the intermediate plate 42, and engages with the outer peripheral side torsion spring 43. Two circumferentially adjacent fourth spring engaging portions 42b engage with both ends of each outer peripheral side torsion spring 43. Specifically, two circumferentially adjacent fourth spring engagement portions 42b engage with the inner and outer peripheral portions of both ends of each outer peripheral side torsion spring 43.

The long hole 42d is formed to extend in the circumferential direction. The stud pin 47 is inserted through the long hole 42 d. Specifically, the body of the stud pin 47 is inserted through the long hole 42 d. In this state, both end portions of the stud pin 47 are fixed to the first side plate 45 and the second side plate 46. The intermediate plate 42 is mounted via the stud pin 47 so as to be relatively rotatable with respect to the first side plate 45 and the second side plate 46.

Outer peripheral side torsion spring 43-

The plurality of outer peripheral side torsion springs 43 are arranged in a circumferential direction. The plurality of outer peripheral side torsion springs 43 are disposed radially outward of the clutch unit 28.

The outer peripheral side torsion springs 43 are held by the outer peripheral portion of the intermediate plate 42, and operate in series with the inner peripheral side torsion springs 41 via the intermediate plate 42.

Both circumferential ends of each outer peripheral side torsion spring 43 are supported by two circumferentially adjacent fourth spring engagement portions 42b of the intermediate plate 42. Further, each outer peripheral side torsion spring 43 is restricted from protruding radially outward by an outer peripheral portion (cylindrical portion) of the intermediate plate 42 between two circumferentially adjacent fourth spring engagement portions 42 b. Further, both circumferential end portions of each outer peripheral side torsion spring 43 are brought into contact with two fifth spring engagement portions 44b of the driven plate 44 adjacent in the circumferential direction.

Driven plate 44

The driven plate 44 is an annular and disc-shaped member, and is fixed to the turbine shell 15. In addition, the driven plate 44 can relatively rotate with respect to the intermediate plate 42.

The driven plate 44 has: a main body portion 44a, a plurality of fifth spring engaging portions 44b, a first locking claw 44c, and a second locking claw 44 d.

The main body portion 44a is formed substantially in a ring shape and is fixed to the turbine shell 15. Specifically, the body portion 44a is fixed to the turbine shell 15 by a fixing method, for example, welding.

The fifth spring engaging portions 44b are integrally formed on the outer peripheral portion of the main body portion 44a, extend toward the engine in the axial direction, and engage with the outer peripheral side torsion spring 43. Each of the fifth spring engagement portions 44b is formed by bending an outer peripheral portion of the driven plate 44 toward the engine side in the axial direction.

The plurality of fifth spring engagement portions 44b are arranged at predetermined intervals in the circumferential direction. The outer peripheral side torsion spring 43 is disposed between two circumferentially adjacent fifth spring engagement portions 44 b. Two fifth spring engaging portions 44b adjacent in the circumferential direction engage with both end portions of each outer peripheral side torsion spring 43.

(detent mechanism)

In the present embodiment, the intermediate plate 42, the second side plate 46, and the driven plate 44 each have a part that constitutes a stopper mechanism for restricting relative rotation of the

plates

42, 46, and 44. The details will be described below.

A cutout 42c is formed in a radially intermediate portion of the intermediate plate 42. The notch 42c is provided between the third spring engagement portion 42a and the fourth spring engagement portion 42b in the radial direction. The notch 42c is formed long in the circumferential direction and is open on the outer circumferential side. On the other hand, as described above, the driven plate 44 is formed with the first latch claw 44c, and the first latch claw 44c is inserted into the notch portion 42 c.

The first locking claw 44c is provided on an inner peripheral portion of the driven plate 44, that is, an inner peripheral portion of the body portion 44 a. The first locking claw 44c is a portion extending from the inner peripheral portion of the body portion 44a toward the engine side in the axial direction. Specifically, the first locking claw 44c is formed by partially bending an inner peripheral portion of the main body portion 44a toward the engine side in the axial direction.

In such a configuration, the rotation of the intermediate plate 42 with respect to the driven plate 44 is restricted by the first latch claw 44c abutting against the circumferential end surface of the cutout portion 42c of the intermediate plate. That is, the notch 42c of the intermediate plate 42 and the first locking claw 44c constitute a locking mechanism.

Further, a notch 46b opened to the outer peripheral side is formed at the outer peripheral end of the second side plate 46. On the other hand, as described above, the driven plate 44 is formed with the second latch claw 44d, and the second latch claw 44d is inserted into the cutout portion 46 b.

The second locking claw 44d is formed on an inner peripheral portion of the driven plate 44, that is, an inner peripheral portion of the main body portion 44 a. The second locking claw 44d is formed by partially extending the inner peripheral portion of the main body portion 44a further toward the inner peripheral side.

In such a configuration, the second latch claw 44d abuts on the end surface of the cutout portion 46b of the second side plate 46, thereby restricting the rotation of the first side plate 45 and the second side plate 46 with respect to the driven plate 44. That is, the notch 46b of the second side plate 46 and the second locking claw 44d constitute a locking mechanism.

(positioning structure of vibration damping part 29)

Fig. 5 illustrates a structure for positioning the vibration damping portion 29. This positioning structure is a structure for positioning the vibration attenuating portion 29 in the radial and axial directions.

In the present embodiment, the turbine shell 15 includes a turbine shell main body 50 and a coupling member 51. The turbine shell body 50 is provided with turbine blades 16 inside. The inner peripheral portion of the turbine shell main body 50 is coupled to the outer peripheral portion of the coupling member 51 by a rivet 52, and the inner peripheral portion of the coupling member 51 is coupled to the flange 17a of the turbine hub 17 by welding or a rivet (not shown). The coupling member 51 has a cylindrical portion 51a extending in the axial direction at a radially intermediate portion.

The cylindrical portion 51a is formed with a first positioning surface 51b and a second positioning surface 51c by cutting or the like. The first positioning surface 51b is formed in a ring shape and parallel to the rotation axis. The second positioning surface 51c is formed in an annular shape and extends radially outward from the end of the first positioning surface 51b on the turbine 4 side, perpendicularly to the rotation axis.

Then, the inner peripheral end surface of the intermediate plate 42 of the vibration damping portion 29 abuts on the first positioning surface 51b, whereby the entire vibration damping portion 29 is positioned in the radial direction. Further, the side surface of the inner peripheral end portion of the intermediate plate 42 abuts on the second positioning surface 51c, and the movement of the entire damper unit 29 toward the turbine side in the axial direction is restricted.

Further, a disk-shaped regulating plate 54 is fixed to the side surface of the front cover 2 on the inner peripheral portion of the connecting member 51. The restriction plate 54 extends further to the outer peripheral side from the inner peripheral end of the first side plate 45 of the vibration damping portion 29. Further, the side surface of the first side plate 45 on the front cover 2 side can abut against the outer peripheral end portion of the regulating plate 54. Thereby, the movement of the entire vibration attenuating portion 29 toward the front cover 2 in the axial direction is restricted.

(action)

First, the operation of the torque converter main body 6 will be described. In a state where the front cover 2 and the pump impeller 3 are rotating, the hydraulic oil flows from the pump impeller 3 to the turbine runner 4, and further flows into the pump impeller 3 via the stator 5. Thereby, torque is transmitted from the pump impeller 3 to the turbine runner 4 via the working oil. The torque transmitted to the turbine 4 is transmitted to an input shaft of the transmission via the turbine hub 17.

Note that, during the engine operation, the hydraulic oil always flows from the hole 17b of the turbine hub 17 into the second oil chamber C2, and is supplied to the clutch plate 31 and the pump impeller 3 via the third oil passage P3.

When the speed ratio of the torque converter 1 increases and the input shaft has reached a constant rotational speed, the hydraulic oil is supplied to the first oil chamber C1 through the first oil passage P1, the oil sump Ph, and the second oil passage P2. The oil pressure in the first oil chamber C1 in this case is higher than the oil pressure of the hydraulic oil supplied to the clutch plate 31 side. Thereby, the piston 32 moves toward the front cover 2. As a result, the pressing portion 32a of the piston 32 presses the clutch plate 31 toward the front cover 2, and the lock state (clutch engaged state) is set.

In the clutch engaged state as described above, torque is transmitted from the front cover 2 to the torque converter body 6 via the lock device 7. Specifically, the torque input to the front cover 2 is transmitted through the lock device 7 on the path of "the clutch plate 31 → the first and

second side plates

45, 46 → the inner peripheral side torsion spring 41 (the large coil spring 41a and the small coil spring 41b) → the intermediate plate 42 → the outer peripheral side torsion spring 43 → the driven plate 44", and is output to the turbine hub 17.

Here, the lock device 7 in the clutch engaged state transmits the torque as described above, and attenuates the torque variation input from the front cover 2. Specifically, when torsional vibration occurs in the locking device 7, the inner circumferential side torsion spring 41 and the outer circumferential side torsion spring 43 are compressed in series between the first side plate 45 and the second side plate 46 and the driven plate 44. In this way, the torque variation caused by the torsional vibration is damped by the operation of the inner torsion spring 41 and the outer torsion spring 43.

Note that, when the lock is released (the clutch disengaged state), the first oil chamber C1 is connected to the drain device. Accordingly, the hydraulic oil in the first oil chamber C1 is discharged through the second oil passage P2, the oil sump Ph, and the first oil passage P1. In this state, the hydraulic pressure of the first oil chamber C1 becomes lower than the hydraulic pressure on the clutch plate 31 side, and the piston 32 moves toward the turbine 4 side. As a result, the pressing portion 32a of the piston 32 releases the pressing of the clutch plate 31. This brings the clutch into the disengaged state.

(torsion characteristics)

Next, the torsion characteristics will be described with reference to fig. 6. In a state where the lock device 7 is clutch-engaged, torque from the front cover 2 is transmitted to the vibration damping portion 29 via the clutch plate 31. At this time, the first side plate 45 and the second side plate 46 rotate relative to the intermediate plate 42 and the driven plate 44, and when a torsion angle is generated therebetween, the large coil spring 41a of the inner peripheral side torsion spring 41 and the outer peripheral side torsion spring 43 are compressed in series via the intermediate plate 42. Thereby, a first torsional rigidity K1 is formed. The determination of the range of torques relative to the torsion angle by means of the first torsional rigidity K1 is shown in fig. 6 by the symbol J1.

Then, as the transmitted torque becomes larger, the relative rotation angles (torsion angles) of the first and

second side plates

45, 46 and the intermediate plate 42 become larger. When the relative rotation angle between the inner and outer peripheral side torsion springs 41 becomes a predetermined angle, the small coil spring 41b of the inner peripheral side torsion spring 41 is also compressed. That is, in this state, the large coil spring 41a and the outer peripheral side torsion spring 43 of the inner peripheral side torsion spring 41 are compressed in series, and the large coil spring 41a and the small coil spring 41b of the inner peripheral side torsion spring 41 are compressed in parallel.

By the above operation, the second torsional rigidity K2 is formed. The determination of the range of torques relative to the torsion angle by means of the second torsional rigidity K2 is shown in fig. 6 by the symbol J2. Then, when the torsion angle is further increased, the first stopper claw 44c of the driven plate 44 abuts on the end surface of the cutout portion 42c of the intermediate plate 42.

When the transmitted torque becomes further large, the relative rotation angles (torsion angles) of the first side plate 45 and the second side plate 46 and the intermediate plate 42 and the driven plate 44 (in this state, the intermediate plate 42 and the driven plate 44 rotate in synchronization) become further large. Here, after the range J2, the relative rotation between the intermediate plate 42 and the driven plate 44 is prohibited, and therefore the operation of the outer peripheral side torsion spring 43 is stopped. That is, after the range J2, the large coil spring 41a and the small coil spring 41b of the inner peripheral side torsion spring 41 are compressed.

By the above operation, the third torsional rigidity K3 is formed. The determination of the range of torques relative to the torsion angle by means of the third torsional rigidity K3 is shown in fig. 6 by the symbol J3. Then, when the torsion angle is further increased, the second latch claw 44d of the driven plate 44 abuts on the end surface of the cutout portion 46b of the second side plate 46. In this state, the large coil spring 41a and the small coil spring 41b of the inner peripheral side torsion spring 41 stop operating.

(characteristics)

In the above-described embodiment, the oil chamber plate 34 is fixed to the side surface of the flange 33b on the piston 32 side, which is the side opposite to the side on which the force acts. Therefore, since the oil chamber plate 34 is supported by the flange 33b, the oil chamber plate 34 can be suppressed from being deformed when receiving a force due to the oil pressure. Therefore, the deformation amount of the oil chamber plate 34 can be reduced with a simple structure without increasing the thickness of the oil chamber plate 34.

(other embodiments)

The present invention is not limited to the above-described embodiments, and various modifications and alterations can be made without departing from the scope of the present invention.

In the above embodiment, the inner peripheral portion of the oil chamber plate 34 is fixed to the flange 33b of the sleeve 33, but the position where both are joined is not limited to this. For example, the flange 33b may be extended to the outer peripheral side, and the radial intermediate portion of the oil chamber plate 34 may be joined to the flange 33 b.

Description of the reference numerals

1 Hydraulic torque converter

2 front cover

4 turbine

7 locking device

31 clutch plate

32 piston

32b engaging projection

33 Sleeve

33b flange

34 oil chamber plate

34a main body part (circular plate part)

34b cylindrical part

37 drive hub

37c slit

Claims

1. A lock-up device of a torque converter for transmitting torque from a front cover to a member on a transmission side via a turbine, the lock-up device comprising:

a clutch unit disposed between the front cover and the turbine;

a piston arranged to be movable in an axial direction and configured to bring the clutch portion into a torque transmission state;

a sleeve fixed to the front cover and having an outer peripheral surface and an annular projecting portion projecting radially outward from the outer peripheral surface, the inner peripheral surface of the piston being supported on the outer peripheral surface so as to be movable in an axial direction; and

an oil chamber plate formed in a disc shape and engaged with a side surface of the protrusion of the sleeve on the piston side, an oil chamber being formed between the oil chamber plate and the piston, and working oil for operating the piston being supplied to the oil chamber,

the annular protrusion of the sleeve is integrally formed with a portion other than the annular protrusion, extending radially outward from the outer peripheral surface of the sleeve, and forms the oil chamber together with the oil chamber plate,

a clearance space that constitutes a part of the oil chamber is secured between an inner peripheral surface of the oil chamber plate and an outer peripheral surface of the sleeve,

the sleeve has an oil passage for supplying working oil to the oil chamber, and an outlet of the oil passage is disposed radially inward of an inner peripheral surface of the oil chamber plate.

2. The locking device of a torque converter according to claim 1,

an inner peripheral portion of the oil chamber plate and the protruding portion of the sleeve are welded.

3. The locking device of a torque converter according to claim 1 or 2,

the oil chamber plate has a cylindrical portion that supports the outer peripheral surface of the piston such that the outer peripheral surface of the piston is movable.

4. The locking device of a torque converter according to claim 3,

the locking device further includes seals respectively provided between an inner peripheral surface of the piston and an outer peripheral surface of the sleeve, and between the outer peripheral surface of the piston and an inner peripheral surface of the cylindrical portion of the oil chamber plate.

5. The locking device of a torque converter according to any one of claims 1, 2, or 4,

the locking device further comprises a drive hub secured to the sleeve,

the piston has an engagement portion that engages with a part of the drive hub and rotates in synchronization with the drive hub.

6. The locking device of a torque converter according to claim 3,

the locking device further comprises a drive hub secured to the sleeve,